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It was Sam, who noticed first. Knowing every muscle of his brother's face and years of studying every one of his tiniest expressions helped, but at the end of the day it was due to that unexplainable connection between the two of them. The strange force that made his time at Stanford less enjoyable and more sleepless. So now he just knows that something is wrong with his brother. And when Dean orders his beloved chili fries and doesn't suck in every last bit in a matter of minutes, Sam and Cas exchange worried looks.
Their case is solved, dinner finished, and they are in for a 9-hour drive home. Another cue that something is not just as it should be is when Dean decides to let Sam drive after an hour and doesn't take a shotgun seat but joins Castiel in the back instead. When Sam glances in the rear mirror, he sees his brother's head resting on the angel's shoulder and the intense stare of the blue eyes.
Dean doesn't wake up the whole ride home. Cas somehow manages to arrange him into a more lying position, with his head on the angel's lap. Sam would have smiled at the sight if he wasn't focused on keeping his eyes open and on the road.
They reach the bunker at dawn, and Dean lets Castiel maneuver him out of the car and down the stairs.
“Get him to his room,” Sam says, his voice hoarse from not using and tiredness. “And I’ll bring some supplies.” Cas just nods and adjusts his grip around Dean's waist. He is taking off the hunter's shoes, when Sam comes in with water and some pills.
“Looks like he is going down with something…” Cas murmurs, letting the back of his palm touch Dean's cheek. He frowns and crouches beside the bed to lightly press his lips to Dean's forehead. “Definitely. His fever is high.” He whispers, now real concern lacing his voice.
The gesture looks a lot like a kiss. Dean would undoubtedly freak out if he was awake. But now Sam is too tired to analyze it further.
“Make sure he drinks a lot. And takes these once he is conscious enough.” he points to the meds. “Want me to stay with you?”
“No, Sam, I got this, you drove the whole night, go get some sleep.”
Sam nods and leaves, though he feels strange. He's never left his brother's side during an illness. Even as a child, he used to cling to his brother when any of them was unwell. Perhaps it had something to do with losing the only source of safety and care. Now Dean has his angel, Sam tells himself, lowering his pounding head onto the pillow. He is out in a few minutes.
In the meantime, Castiel frees Dean of most of his clothing, careful with every movement, expecting the hunter to shove him away and yell. But he doesn't react more than with a quiet sigh, and feeling his skin radiating unnatural heat makes Castiel worry even more. He tries to wake Dean up, but only succeeds in making him swallow some pills without choking. When the fever is still high, regardless of the meds, Castiel's anxiety reaches a dangerous level bordering panic. What if he is doing something wrong? Or not doing enough? He stares at the pale face of his friend, thinking. Dean would know what to do. He always does. Dean dealt with countless of Sam's childhood illnesses, even more wounds requiring various types of stitches, his father's drunken fits and hangovers. But now it's Dean who needs help, and Cas feels uncertain and incompetent. Afraid that he could make things worse. What is he supposed to do? Should he go get Sam?
Dean stirs in his sleep, and Castiel's train of thoughts is interrupted. He focuses on his friend, whose brow frowns, and his whole body tenses under the covers. Hands grip the sheets tightly and suddenly he opens his eyes wide, staring terrified and unseeing through the ceiling, breathing shallow, quick breaths. What is he seeing, Cas can only guess, but he is afraid he can guess correctly.
“Hey… Easy…” Cas reaches for Dean's hand and feels fingers clutching his wrist like a lifeline. “Whatever you see, it's not real. You are safe here, with me. It's just a dream. It's not real.” Cas whispers over and over again until Dean rests his head on the pillow and falls asleep, not letting go of his angel’s hand.
So until he loosens his grip, Castiel has no other option but to sit down on the floor by the bed and try to make himself comfortable. He feels Dean’s quick pulse under his fingertips and watches an unhealthy blush coloring hunter's cheeks. After what feels like hours the idea pops into Cas’ mind, and he makes a quick run to the sink with a handful of handkerchiefs. As soon as the wet cloth touches hot skin, Dean shudders violently and makes a little sound close to whimper. Cas's heart tightens. He puts his hand on Dean's cheek to calm him down, and the hunter leans into the touch as if trying to find some relief. The angel sits on the bed and cradles Dean's head, wanting to absorb the heat, illness, and pain.
“You are going to be ok, I'll take care of you.” He whispers to the unconscious man and feels Dean's chaotic fear and suffering flooding him, leaving him breathless. He has to do something, anything, to help, and fast. The echo of Dean's headache pounding in his own skull.
Dean is drifting in and out of consciousness, never lucid enough to hold a real conversation, just searching the space with glassy eyes that close with relief once he makes sure Castiel is with him.
“You are not alone,” Castiel tells him, knowing very well that Dean won't remember anything. “You won't be anymore.”
Hours go by and Castiel fills his time with wiping Dean's face, trying to get some water into him, changing cold compresses, and constantly checking the temperature. With zero improvement so far. Why is nothing working?
Finally, Cas knows he can't delay it anymore and a decision has to be made now. It's been hours and they haven't made any progress. Dean is exhausted and completely out of it from pain and fever, and Cas can't look at his dry lips and glistering, unseeing eyes any longer. It's time to take serious steps.
Dean is heavy. The dead weight of his nearly unconscious body is hard to carry. But not for the angel, who lifts him with ease, just like all these years before when they were leaving Hell. Castiel carefully lowers his trembling burden into the tube, and Dean immediately curls into a tight ball, shivering uncontrollably. Cas starts the lukewarm water and strokes Dean’s chest and back.
“Easy… try to relax” he murmurs, enfolding the hunter's arms. “This is going to help, you will feel better soon, just relax.” And finally, Dean does. Once the tube is filled, he straightens his legs and seems to be drifting off again. He slides a little and would go under if it weren't for Castiel’s grip.
“I’ve got you,” the angel sighs softly. “Don't worry, just relax and rest” he whispers, gently rubbing his chest and stomach in a slow circular motion.
This could be so much fun in different circumstances, Castiel thinks to himself, taking in his lover’s slim, muscular figure under the clear surface… What is he thinking about?! , he scolds himself immediately. It's definitely not a good time for such things. He has to admit to himself that he appreciates the sight before his eyes, though.
Returning to the bedroom is surprisingly difficult because Dean, now somewhat conscious and wrapped tightly in the biggest towel the bunker can offer, insists on going on his own. This proves to be not the best idea when after a few steps his legs fail to support him, and he is forced to accept Castiel's outstretched arm reluctantly.
The angel doesn't speak much now when Dean is able to comprehend what is being said to him. Helping Dean change into fresh clothes, and passing him pills and a glass of water, Cas carefully observes his patient, not daring to think that the worst is over now. Once Dean dozes off again, his fever rises a few degrees but only to break after a few hours, leaving the hunter drenched in sweat, weak and tired but finally fully awake and aware of his surroundings.
Seeing Dean putting on his T-shirt without help convinces Cas that his job is finished. He stands up slowly, mutters some “I’d be going” and turns to leave. That's when his hand is gripped one more time this night.
Cas catches Dean’s gaze lucid at last and though the man doesn’t utter a sound, the angel can hear one word, clear as a bell: Stay.